In this problem students must transform expressions using the distributive, commutative and associative properties to decide which expressions are equivalent.

The purpose of this task is to directly address a common misconception held by many students who are learning to solve equations. Because a frequent strategy for solving an equation with fractions is to multiply both sides by a common denominator (so all the coefficients are integers), students often forget why this is an "allowable" move in an equation and try to apply the same strategy when they see an expression.

This is a standard problem phrased in a non-standard way. Rather than asking students to perform an operation, expanding, it expects them to choose the operation for themselves in response to a question about structure. The problem aligns with A-SSE.2 because it requires students to see the factored form as a product of sums, to which the distributive law can be applied.

The purpose of the task is to get students to reflect on the definition of decimals as fractions (or sums of fractions), at a time when they are seeing them primarily as an extension of the base-ten number system and may have lost contact with the basic fraction meaning. Students also have their understanding of equivalent fractions and factors reinforced.

The accuracy and simplicity of this experiment are amazing. A wonderful project for students, which would necessarily involve team work with a different school and most likely a school in a different state or region of the country, would be to try to repeat Eratosthenes' experiment.

This art history video discussion examines the Caryatid (South Porch) and Ionic Column (North Porch), Erechtheion on the Acropolis, Athens, marble, 421-407 B.C.E. (British Museum, London). Mnesicles may have been the architect.

This lesson is designed to supplement a high school English class reading The Crucible or a high school history class studying the Salem Witch Trials. Students will understand one theory of the cause of the witch trials and how they could have been prevented.

Students learn about water erosion through an experimental process in which small-scale buildings are placed along a simulated riverbank to experience a range of flooding conditions. They learn how soil conditions are important to the stability or failure of civil engineering projects and how a river's turns and bends (curvature, sinuosity) make a difference in the likelihood of erosion. They make model buildings either with a 3D printer or with LEGO® pieces and then see how their designs and riverbank placements are impacted by slow (laminar) and fast (turbulent) water flow over the soil. Students make predictions, observations and conclusions about the stability of their model houses, and develop ideas for how to mitigate damage in civil engineering projects.

The Essay Map is an interactive graphic organizer that enables students to organize and outline their ideas for an informational, definitional, or descriptive essay.

A simple hierarchical, planning map for essay creation with a few "Keep in Minds."

This site offers an English-language essay writing system. It allows you to put your ideas in the right place, in the right way.

"Support the transition to virtual learning and help students think critically and compassionately about what they see online."

Lessons for a wide variety of grades 3-12 grouped according to:
1. Online communication
2. News & Media
3. Media Balance
4. Cyber-bullying

Also - videos and discussion activities.

This website highlights the importance of nine "Essential Skills" as identified by the Government of Canada. It discusses the importance of reading, writing, oral communication, thinking, document use, digital skills, numeracy, working with others, and continual learning. It features videos that explain each of the essential skills as well as teacher resources that show how these essential skills are used in various occupations or jobs.

Explore the rest of the Skills Canada to learn about skills competitions, explore skill profiles for various trades, and more.

This site offers geography and history activities showing how two years in history had an indelible impact on American politics and culture. Students interpret historical maps, identify territories acquired by the U.S., identify states later formed from these territories, examine the territorial status of Texas, and identify political, social, and economic issues related to the expansion of the U.S. in the 1840s.

Establishing Norms for Meetings, PLCs, or a Classroom
Establishing norms helps set clear expectations that everyone in the class or learning community can build together and agree to.

This short video and interactive assessment activity is designed to teach fourth graders about estimating measure by image: centimeters or meters?.

This short video and interactive assessment activity is designed to teach fourth graders about estimating measure by description - multiple choice.

The task is designed to show that random samples produce distributions of sample means that center at the population mean, and that the variation in the sample means will decrease noticeably as the sample size increases. Random sampling (like mixing names in a hat and drawing out a sample) is not a new idea to most students, although the terminology is likely to be new.